However, migration does not take place purely at the SAN level (server-free or device-to-device copy). It becomes an I/O stream from the disk devices, through the NetBackup server, to the tape device.
Using Disk Staging, it is possible to duplicate the data before or after it was migrated to tape. The Vault Option allows defining different retentions between the disk and tape copies of the data.
Dig deeper on Disk drives
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